Grate.



A. B. COATBS.

GBATE.

APPLICATION FILED JUNEI'T. 1913.

1, 1 1 9,808. Patented Dec. a, 1914.

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Z g @51a VUE NORR/S PETERS CD., PHOTO-LITHO., WASHING VON, D C

A. B. COATES.

GRATE.

APPLICATION FILED JUNE I7, 1913.

Patented Dec. 8, 1914.

2 SHEETS-SHEET 2.

BTH, KANSAS, AssieivonBY planer Ann Mnsivn AssIGN- ARCH `i2.. coATEs, on nLLswo y y r cnnnRArrsLAcK isneivnncoivirAivY; or ELLsWoR'rH,

MENTS, T ECONOMY `FOR KANSAS.

To all iviom Appiication ined :rune 17, 191s,l Sei-iai No. 774,226.

it may concern .i

of Kansas, have invented ce useful Improvements in Grates,

following is a specification.

ns rATnN'rorricn y GRATE.

Specification of Letters Patent.

,` Anon B. CoA'rns, citiates, residing at llllsf Ellsworth and State rtain new and of which the ,i My present invention relates to an irnproved grate cons and more particu over the grate construction s eo-pending application i and bearing l then `specifically po which is attached to an this application.

mary object of the provision o advantages tion set forth in t tion and at the saine ti l economical in construction and filed berial Number `T truction for steam boilers, larly to an improvement et forth in my April 15, 1913 61,3?8, the pritlie present invention being f a grate possessing all the incident to the grate construche above named applicaine one which is more more readily applied to furnaces now inuse.

A further is to provide a grate `having object of my lpresent invention `hollow grate bars so formed that the grate may be used either in connection in connection with sired.

Afurther object of my ini construct the grate t burned ther eon withoutl plete grate forms in effect a c or fuel bed, only such narrow requisite g for the necessary formed in the gratebars, and

construction practically no through the openings in the such ashes as do fall through ash pit inthe furnace, in no way interfering i with the draft.

a forced draft,

applied that it may thereby removing with a forced draft or a natural draft, as deention is to so hat fine fuels` lmay `be waste, `asthe cornontiniious floor spaces as are draft being because of this ashes w ill pass grate bars and willfall to the when the above grate is i the draft is so be ein- ]ects in view, my

invention will bemore fully described, illustrated in the.` accompanying In the dr view of a conventiona boiler furna top plan vie awings ce showing the a is w of the grate; F

inted out in the d forms a part of drawings and claim Figure 1 is a sectional l form of boiler and pplication of a in accordance with my a fragmentary ig. 3 1s a longi- Patented Dec. 8, 1914.

tudinal section through one of the grate bars shown in Fig. 2, Figa is a transverse section of Fig. `3 looking toward the rear;` Fig. 5 is a perspective viewof one of the grate bars employed in the grate shown in Figs. 1 to il, inclusive, of the drawings.

To insure a clear understanding of the construction and operation of iny improved grate, I haveillustrated the saine in connec- Vtion with a boiler and a boiler furnace of conventional design in which 10 indicates the front wall of the furnace, 11 the bridge wall, .12 thefloor or base, 13 `the ash pit and 14 the fire box. withtlie usual door openings and doors pei'- initting communication with the ash pit and fire box, the door tothe lire box being indicated by thenuineral l5 and being hinged to swing into closed position against a rectangiilar door frame 1U having a dead plate li'. ,'1`he grate, which is indicated as a whole by the numeral 18, is supported on a level with the dead `plate by two or more transverse supporting bars 19, bearing at its rear end against the bridge wall and at its forward end against thedead plate of the door frame. Referring more specifically to Figs. '2 .to` 5 of the drawings, it will be noted that the i grate is made up of :separate and unconi necting `the end portions `of the side walls, and cross braces zal arranged at suitable intervals and `connectiiigthe side walls, all of `said parts being cast or otherwise integrally formed. It will be noted that at the outer end of the grate bar the side walls are somewhat higher than throughout the remainder of their length, the front wall beingliiglier than `the `rear wall and the side walls having `their upper forward edges inclined, as clearly shown in Figs. 3 and 5 of the drawings. i y

The inain body of the grate bar, described, open y nially closed at its top by daft plates 25 and QG the former ofwhichextends froin the rear or inner end of the grate bar to that point where the side walls are extended upwardly and the latter of which is seated upon said latter portions of the side walls and consequently atan inclination to the plate 25. This `manner of constructing the as above a whole at its bottoinand is nori y r apart vertical side y walls 21, "'lrontand rear walls 22 and 23 coni grate `bars causes the grate to be slightly higher ad j acentv the door vthan at other` points and therefore insures the proper positioningKV '.lhese draft of the fuel upon the grate. plates are secured to the body of lthe grate bar proper by bolts 26 passed through the draft plates and braces 24 and secured by nuts 27, the heads of the bolts being countei-sunk in the upper faces of the draft plates. Each of the draft plates 25 and 26 is provided with a plurality of draft openings in the forni of narrow, elongated, unconnected slots 28. These slots may be arranged in any suitable position with respect to each other, although the herring bone arrangement illustrated in the drawings is preferred. The bodyr proper of the grate bar is provided at its lower edge with a laterally directed marginal flange`29 which eX- tends completely around the grate bar and the purpose of which will be hereinafter eX- plained. ln constructing the grate the grate bars are mounted one beside the other with the spacer flanges 29 of one bearing against the spacer flanges of the adjacent bars and against the dead plate and bridge wall of the furnace, which spaces the grate bars a slight distance from each other, and from said walls to allow for expansion of the metal of which they are formed, whenv heated. The spaces thus formed between the upper portions of the grate bars and between the upper portions of the dead'plate and bridge wall are filled with a packing 30 of asbestos wool or other suitable heatresisting material which will prevent the accumulation of ashes `between the bars and provide a continuous uninterrupted floor or fuel bed, while at the same time it will permit the bars to expand.

lt will be apparent that with a grate of the above described character a natural draft, through the door or door opening lof the ash pit, will in many instances be sufficient. lf, however, a forced draft is desired, air may be driven into the ash pit beneath the grate through a pipe or other suitable conduit 3l, the air being supplied to the pipe from any suitable source as a blower conventionally shown at 32.

lt should be noted that no ashes orother waste can pass through the grate except through the draft openings 28 thereof and the draft passing through these openings to the lire will usually be lsuflicientr to keep them clear of ashes. Any ashes or waste, however, which does pass through these openiiilgs will be accumulated in the ash pit Aof the furnace and may be removed from it by opening the door to the ash pit and blowing the same out by means of a forced draft from the blower 32.

The grate bars may be made in various sizes and proportions to suit the type of lire box with which they are to be used and may of course be supported in any suitable manner in the fire box. Ther type of grate construction above described is extremely effective in operation, greatly increasing the heating capacity of the furnace, due to a more complete combustion of the fuel used therein. Each grate bar being entirely separate and independent of the others is perfectly free to expand in any direction, and in case of injury may be readily removed for repairs or replaced by another without disturbing the remainder of the grate.

lt will of course be understood that various changes, within the scope of the appended claim, .may be made at any time in the construction of the grate bars or in the mannerof assembling or forming the coinplete Grate without in the slightest degree departing from the spirit of my invention.

By forming the draft plates separable from the bodies of the grate bars it will be apparent that in case any draft plate becomes broken, burnt out or otherwise injured, it may be removed and replaced by another without the necessity of removing the entire grate bar. The ash pit is air tight and the air isconipressed in the ash p pit and 'forced through the slots of the grate. Having described my invention, what I claim is:

' In a grate construction, a hollow grate bar including spaced side andV end walls having their lowerl edges in the same plane, and transverse braces `connecting the side walls, all of saidv parts being integrally formed, the walls at their lower edges being a provided `with outwardly directed spacer flanges, plates restingy onfthe upper edges of the walls and provided with a plurality of openings for the passage of air through vthe grate bars, and fastening vdevices inserted through said plates into and through the braces. f

In ltestimony whereof I aflix my signature in presence of two witnesses.

' ARCH B. CCATES. [L.s.j Vitnesses:

ELDEN R. SHAW, W. R. SEAvnR.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. l 

